Disk plow



E. A. DAVIS Dec. 11, 1951 DISK PLOW 4 Sheets-Sheet 1 Filed July 2, 1945 ma MW M w R u Z a. w b

E. A. DAVIS Dec. 11, 1951 DISK PLOW 4 Sheets-Sheet 2 Filed July 2, 1945 S .15 Y mm m fl W i M n W w {Q MQ mg g) Dec. 11, 1951 E. A. DAVIS DISK PLOW 4 Sheets-Sheet 3 Filed July 2, 1945 INVENTOR. flfocb A E. A. DAVIS Dec. 11, 1951 DISK PLOW 4 Sheets-Sheet 4 Filed July 2, 1945 INVENTOIL. [1706/7 17m BY M Patented Dec. 11, 1951 UNITED srA ss e QF I 10 Claims.

This invention relates to an agricultural machine and particularly to a disk plow and an object of this invention is to improve agricultural machines of this type and to increase the efficiency of the same.

Another object is to provide means for applying a draw bar pull to a disk plow in such a manner that the pull tends to hold the plow disks in the ground and also tends to offset the side draft incident to the relative pressure of the ground against the plow disks.

Another object is to provide a disk plow in which a plow frame is pivotally supported by a front bolster and a rear bolster and carries plow disks positioned at one side of the pivotal axis of said plow frame and in which a draft means is adjustably connected with the plow frame at a location near the plow disks and between the plow disks and the pivotal axis of the plow frame.

Another object is to provide a disk plow having a tilting frame carrying plow disks and having novel and efficient power operated means for tilting said frame to lift said plow disks out of the ground.

Another object is to provide efficient scraper means for keeping the dirt cleaned off of the plow disks without danger of injuring the disks.

Another object is to provide highly efficient dirt excluding bearings for use in a plow, or agricultural machine of this type, or other types of machines where similar problems exist in whole or in part.

The above mentioned general objects of my invention, together with others inherent in the same, are attained by the device illustrated in the following drawings, the same being preferred exemplary forms of embodiment of my invention, throughout which drawings like reference numerals indicate like parts. a

Figure 1 is a side elevation of a disk plow constructed in accordance with this invention;

Fig. 2 is a view with parts shown in plan and parts shown in section substantially on broken line 2-2 of Fig. 1;

Fig. 3 is a rear elevation showing the rear axle or bolster and rear wheel structure of this plow;

Fig. 4 is a view partly in section and partly in elevation taken substantially on broken line 5 of Fig. 2 and showing the front axle or bolster and front wheel structure of this plow;

Fig. 5 is a somewhat diagrammatic detached view with parts shown in elevation and parts shown in section substantially on line 5-5 of Fig. 2, showing apparatus used on this plow for lifting and supporting the plow disks clear of the ground, parts being omitted and parts that would not appear along section line 5--5 being shown diagrammatically by dot and dash lines;

Fig. 6 is a fragmentary sectional view with parts in elevation and parts broken away showing portions of the plow lifting means;

Fig. 7 is a view in cross section through the plow frame and hitch means taken substantially on line 7-4 of Fig. 2;

Fig. 8 is a fragmentary detached sectional .view taken through the bearing of one of the plow wheels, showing dirt excluding bearing means used in connection with this plow;

Fig. 9 is a view of said bearing means taken substantially on broken line 9--9 of Fig. 8;

Fig. 18 is a fragmentary sectional view through the bearing of a plow disk showing a dirt excluding bearing structure;

Fig. 11 is a fragmentary sectional View showing scraper means used in connection with this plow to clean the plow disks;

Fig. 12 is a fragmentary plan View with parts in section, showing means for extending or lengthening this plow frame and means for operatively supporting thereon a plurality of plow disks of smaller diameter than the disks shown in Figs. 1 to 4;

Fig. 13 is a side elevation of the multiple disk assembly shown in Fig. 12;

Fig. 14 is adetached plan view of the type of plow disk supporting beam shown in Figs. 1, 2, 12 and 13;

Fig. 15 is a detached side elevation of said plow disk-supporting beam; and

Fig. 16 is a detached plan view of an adapter member used in connection with the beam shown in Figs. 14 and 15 when said beam is used for supporting disks in the manner shown in Figs. 1 and 2.

This plow includes a front axle means or bolster 20 and a rear axle means or bolster 2! supported by four wheels 22, '23, 24 and 25. The wheels 22 and as are land wheels and adapted to run on unplowed land. The wheels 23 and 25 are furrow wheels. The two bolsters 29 and 2! are substantially parallel and are transversely offset relative to each other. They are connected with each other by diagonally positioned plow frame means. This plow frame means comprises a longitudinally extending coupling shaft or member 25 that is connected with a longitudinally extending angle bar 21 by transverse frame members 28, 23", 29 and 29. The respective forward and rear end portions of the coupling or shaft member 26 are pivotally connected by aligned diagonal bearing means with the front bolster 20 and rear bolster 2|. One preferred way of making these pivotal connections is to secure two spaced apart aligned bearing members 30 and 33 to the front bolster 20 diagonally thereof and to secure two similar aligned spaced apart bearing members 3| and 34 to the rear bolster 2| diagonally thereof. The front bearing members 39 and 33 and rear bearing members 3| and 34 are coaxial. All of the bearing members 30, 3|, 33 and 34 are counterbored for the reception of sleeves 32 that are fixedly secured, as by pins 38, on the respective end portions of the coupling shaft 26. The ends of sleeves 32 and ends of coupling shaft 26 cooperate with the bearing members 30, 3|, 33 and 34 to resist end thrust.

The chambers or pockets 35 between the two front bearing members 30 and 33 and between the two rear bearing members 3| and 34 constitute grease pockets and are covered by jacket members 36. Preferably packing devices 31 are provided at the end of each of the bearings 33 and 34 to prevent escape of grease along the shaft 26.

When the plow is in operation the angle bar 21 is adapted to rest on adjustable supports l9 that are in duplicate, one at the front bolster 29 and the other at the rear bolster 2|. The supp s are carried by bolts l9 and are adjustable by nuts I8. The depth of cut of the plow disks is deter; mined by the adjustment of the supports l9. Figs. 1, 3 and 4 show these supports set for a maximum depth of cut. Means independent of the supports |9 are provided for raising and lowering the plow frame, as hereinafter described.

The two frame members 29 and 29 have rigidly connected tubular sleeve members 40 that fit over the coupling member 26 and are rotatably mounted thereon. The frame members 28 and 28 also fit rotatively over the couplin member 26. Preferably the ends of the sleeve members 49 are provided with outwardly extending cylindrical bosses 4| of smaller diameter than the members 40. Two of the bosses 4| are adapted to fit within suitable cup shaped recesses 42 in the frame members 28 and 28 and the other two bosses 4| are adapted to fit within similar recesses in cap members 43. Thus dirt excluding connections are provided. The cap members 43 are rigidly secured to the coupling shaft 26, as by pins 44 and serve as end thrust bearings for the tubular sleeve members 40.

The frame members 29 and 29 have downwardly extending flanges 45 along their outer edges, see Fig. 7, and have a common bottom plate 46 secured thereto as by bolts 41. The plate 46 and flanges 45 cooperate with the frame members 29 and 29' to form guideways for the side members 48 of U-shaped plow supporting beams, see Figs. 1, 2, 3, 4, and 15. Also, the plate 46 serves as a member to which draw bar hitch means may be adjustably connected as hereinafter explained.

The beam members 48 are provided with notches 50, see Figs. 2 and 14, for the reception of readily removable pins by which the beam members 48 are secured to the frame members 29 and 29' in such a manner as to be readily longitudinally adjustable thereof for the purpose of adjusting implements that are supported by said beam members.

Each pair of beam members 48 has a hub 52, Figs. 2 and 15, rigid with the outer ends thereof.

Each hub 52 is provided with a vertical bore 58 for the reception of an upright shank 54. A soil cultivating implement, such as a concavo-convex plow disk 55 is supported from the lower end portion of each shank 54, preferably by dirt excluding bearing means of a type shown in Fig. 10.

Each shank 54 is adjustably supported in its hub 52, both as respects its vertical and angular position in said hub. One way of obtaining this adjustment is to provide a plurality of vertically spaced transverse holes 56 near the upper end of each shank and to secure a hubbed disk 51 (see also Fig. 15) to each shank by a bolt or pin 58 (see Fig. 1) that passes through one of the holes 56. Each disk 51 has teeth 69 on its bottom surface that interlock with other teeth 6| on adapter disks 62, Figs. 15 and 16, that rest on the hubs 52. Bolts 63 extend vertically through holes 64 in the hubs and holes 65 in the disks 62 and slots 66 in the hubbed disks 51 (see Figs. 14, 15, and 16). These bolts 63 secure the hubbed disks 51 to the hubs 52 in such a manner that said hubbed disks 51 and the shanks 54, to which they are secured, can be angularly adjusted to position the plow disks at a desired angle. It will be noted that the adapter disks 62 are not used in the structure shown in Figs. 12 and 13.

For the purpose of deflecting the dirt of! of the plow disks 55 and keeping said plow disks clean I provide, for each plow disk, a curved scraper 39. Each scraper 39, Fig. 11, has a sharp edge I! that is positioned in close proximity to, but not in gouging contact with, the plow disk. Each scraper 39 is adjustably supported by a bracket member 49. Each bracket 49 is rigidly connected, as by cap screws 69 (Fig. 2) with a support, as with the hubbed disk 51 that is positioned on top of the hub 52 of one of the plow beams 48.

To make it possible to position the sharp edges 39' of the scrapers 39 in very close proximity to the faces of the plow disks 55 without danger of having said sharp edges 39' gouge into the plow disks 55, I provide on the back of each scraper 39 two or more spaced apart guard members 59. Each guard member 59 has a surface 59' of substantial area that conforms substantially to the shape of the plow disk and is adapted to engage with and rest on the plow disk in such a manner as to insure proper positioning of the sharp edges 39' of the scrapers and to prevent said sharp edges from gouging into the plow disks. These guard members 59 thus overcome an objectionable fault heretofore present in the operation of scrapers of this type.

The dirt, excluding bearing means for each plow disk 55, see Fig. 10, includes a plate 61 secured as by rivets 68 to the plow disk 55. Each plate 61 has a rearwardly extending hub 10 that is provided with an outwardly extending annular dirt excluding flange 1|. Each hub member 10 is positioned in a dirt excluding housing 12 of inverted U shape that is secured to the lower end portion of the shank members 54.

A bearing axle or spindle 13 is rigidly secured to the hub 10 and extends rearwardly therefrom through an opening in the back wall of the housing member 12 and through packing means 14 into a bearing box or chamber 15 in the lower end portion of the shank 54. A portion 16 of the bearing axle 13 is of larger diameter than the remainder of said axle to cooperate in the provi-- sion of thrust bearing means. The rear end portion of said shank also cooperates in providing thrust bearing means and is further rounded or tapered in the manner shown in Fig.

to provide ample room for grease which may be introduced under pressure through a standard grease fitting B4 of check valve type. 1

The. bearing for each of the plow wheels 22 23 and 25 is of the type shown in Figs. 8 and .9. llhe landwheel 24 is a power wheel and has a bearing of different type as shown in Fig.6. Referring to Figs. 8 and 9 which show the bearing means for wheels, as the from; land wheel 22, there is shownhub members I1 and 18 secured to wheel 22, as by bolts 80. The wheel 22 and hub members I1. and I8 are rotatively mounted on a bearing, axle or spindle. This axle preferably comprises two end portions 8| and 82 of smaller diameter operatively disposed in hub members I! and I8 respectively and a medial portion 83 of larger diameter operatively disposed in the wheel 22 between the hub members 11 and I8, The larger axle member 83 servesas acombinedradial and thrust bearing for the wheel 22, and theparts 22, TI and I8 forma bearing box. The hub member l'l functions as a grease housing and has a standard grease fitting 84 connected therewith. The hub member 18 extends into a dirt excludins ho i 8 of inv r U s p Anu 6. of larger external diameter than the portion of the hub 18 adjacent to said nut, is threadedonto said hub I8. This nut 86 provides an annular dirt excluding shoulder which helps to prevent dirt from gainingaccess to the bearing through the nut 86 and around the axle member 82. Preferably packing 8'! is provided within the nut 86 to retard leakage of grease. Theaxle part 82 extends into and is rigidly secured to a bearing block88. A, The arin bl k fiflhasve ally aligned upper andlower pivot members 98 and 8| that are pivotally mounted respectively in the front bolster 20, Fig. 4, and in an angle bracket 92 that is rigid with said front bolster. i H I The furrow wheels 23 and 25 aremounted on bearing blocks 93and34respectively, Figs. 4 and 3,, that are. similar tothe bearing block 88 and are similarly mounted on vertical pivot means 98 and 9| in the front axle 2|) and rear axle 2| and in brackets 92. e I p v i v The dirt excluding bearing means for each of the furrow wheels 23 and 25 is similar to that shown in Figs. 8 and 9 and just hereinbefore described except that the bearing axle or spindle of each of said furrow wheels 23 and 25 1s preferably secured to its bearing block at an incline as indicated by dotted lines in Figsgl and 3. This incline of thespindles is such that it causes the furrow wheels 23 and 25 on the right handside m of the plow to tilt outwardly at the top. This tilting of wheels 23 and 25 makes them more efiicient in resisting side draft. 7 W V The bearing block 94 which carries the spindle for the right rear wheel 25, Figs. 2 and 3, is adjustable on its vertical axis so that the degree of toe-out of this rear wheel 25 can be adjusted. To provide for this adjustment two plates 95 and 96 are rigidly secured respectively to the rear bolster 2| and to the bearing block 94. The plates 95 and 96 are disposed in face to face relation so thaethey can be slidably moved relative to each other by angular movement of said block 94 ,relative to the rear bolster 2!. At least one of said plates, such as plate 95, is provided with a plurality of holes 97 for the reception ofa bolt98 which passes through both plates. Adjustment is had by removing the bolt 88 and replacing it-in selected holes. e e l i c The left rear wheel 24 is used as a power wheel to furnish power for lifting theplow disksclear of the ground. This wheel 24, Fig. 3, is secured to an axle shaft Iflt that is journaled in 'a bracket or block I0 I. The block IIlI is adjustably mounted by vertical pivots I82 and H33 in the rear bolster 2| and in a bracket I04. The pivot member I02 is keyed or otherwise rigidly and non-rotatively secured to a bracket I; Fig. 2, on top of the rear bolster 2|. The bracket I05 is adjustably secured to said rearbolster 2|, as by bolts I06 operating in slots Ifll in the bracket I05.

The inner end of the axle shaft I 00 extends into a cylindricalshell, Figs. 3, 5 and 6, formed of two spaced apart plates H8 and III that are rigidly connected together by an annular marginal spacer member I I2. The plate IIB is rotatively mounted on the axle shaft I88. The plate III is rigidly connected with a short shaft H3 that is journaled in a bracket H4 which is rigid with the block IIiI. A ratchet member II 5 with preferably one tooth H6 thereon is secured to the end portion of the axle shaft I08 between the plates III! and III. An L-shaped pawl III, Fig. 5, is mounted between the plates I I8 and I I I on pivot means IIS and is provided with a hook shaped part I29 adapted to engage with the tooth III; of the ratchet member I I5 to lock the shell formed by members H8, III and II 2 to the axle shaft I80. The pawl II? has an outwardly protruding end portion I 2| that is adapted to be engaged by a lever member I22 to move the hook I20 of said pawl into engagement with tooth II8 of the ratchet member I I5. The portion |2I is further adapted to strike against a trip member |23 to release said hook from the tooth H6 after the plow disks 55 have been raised clear of the ground. v A tension spring I24, shown in Fig. 3 and shown diagrammatically by dotted lines in Fig. 5, is connected with the end portion I2I of the pawl II! and is positioned so that its line of pull will be onone side of the axis of the pivot H8 when the pawl H1 is disengaged fromth'e ratchet member I 5 and will be on the other side of the axis of said pivot II8 when the pawl II! is engaged with the ratchet member H5. The spring I24 will thus yieldingly hold the pawl Ill in either an engaged or disengaged position relative to ratchet member H5 and the pawl will be readilyreleased from the tooth I I6 when arm I2I encounters the stop 523. e

The bracket :04 is provided with a relatively large opening I 25, Fig. 6, through which the short shaft II3 passes. This opening I25 affords r'oo'm forswinging movement of the short shaft II 3 when the left rear wheel 24 is angulariy adjusted. The short shaft I I3 is connected by a universal joint I26, Figs. 3 and 6, with an upwardly inclined shaft I27. This shaft I2! is connected bya universaljoint I28 with a horizontal shaft I38. The shaft I 38 may bfeof square cross section as shown in Fig. 6. Said shaft I38 is slidably connected with the, hub portion I 3| of a lifting arm I 32. The 'slidable connection of shaft I30 with hub por. tion I 3| provides for turning hub portion I3I whenever shaft I 30 is rotated but leaves the shaft I30 longitudinally movable in the hub I3! to permit angularadju'strhent 'of the block IUI and left rearv wheel shaft I08. Hub I3I is journaled in bearing means I33 that is rigid with the rear bolster 2|. i a s I Theouter, end portion ofthe lifting arm I32, Figs. 2and 5 is provided with a roller I34 that is adapted to engage with the angle bar 21 and exert a lift thereon when said lifting arm I32 is angularly moved by the power wheel 24.

Power to exert a lift on the forward end portion of the angle bar 21 is also taken from the source that angularly moves the lifting arm I32. This is accomplished by providing on the hub II a downwardly extending lever arm I35 that is connected by link means I36 with another lever arm I31 on a shaft I38. The shaft I38 is further provided with a second lever arm I40 which is connected by a flexible cable I4I with a lever arm I42 on a front lifting shaft I43 that is journaled in the front bolster 20. The front lifting shaft I43 carries a front lifting arm I44 provided with a roller I45 that engages with the front end portion of the angle bar 21 and is adapted to exert a lift thereon. Lifting arms I32 and I44 and parts connected therewith are shown diagrammatically by dot and dash lines in Fig. 5.

The cable I passes over two sheaves I46 and I41 that are supported from brackets I48. The brackets I48 are secured to the members 40 and extend sidewise therefrom and support the sheaves I46 and I41 a substantial distance above the line of pull of the cable I4 I. When the power from wheel 24 is applied to lift the plows it will draw the cable I taut. This will exert a downward pull on the brackets I48. At the same time a lifting force is being applied to the angle bar 21. This tends to tilt the plow frame upwardly about the axis of the main shaft 26 and provides a better balanced and more eflicient lifting arrangement than would be provided if the sheaves I46 and I41 and brackets I48 and parts connected therewith were omitted.

To hold the plow frame and disks in a raised position I preferably provide on the hub portions of the two lever arms I40 and I42 teeth I50 and II respectively that are adapted to be engaged by bell crank shaped latch members I52 and I53 respectively. Latch members I52 and I53 are fulcrumed on pivots I54 and are connected with each other for simultaneous operation by cable means I55.

A trip line I56 is connected with the forward bell crank shaped latch member I53 and may extend to the tractor by which the plow is drawn for convenient manipulation by the tractor driver so that he can either raise or lower the plows easily.

The rear bell crank shaped latch member I52 is connected by a tension spring I51 with a bell crank lever I58. The bell crank lever I58 is mounted on a fulcrum I60 and connected by a link member I6I with the pawl operating lever I22. Another tension spring I62, stronger than the spring I51, has one end connected with the bell crank lever I58 and the other end connected with a bracket I63 rigid with rear bolster 2I. Also, a normally slack flexible tie member I64, such as a piece of cable, connects the upper end portions of bell crank lever I58 and latch member I52 in such a manner as to limit the elongation of spring I51; Angular movement of bell crank member I58 in the direction in which it is urged by spring I62 is limited by engagement of said member I58 with the rear bolster 2|.

The draw bar or hitch means used to pull the plow, Figs. 1 and 2, is adjustably connected directly with the plow frame members 26 and 21 approximately midway between the front and rear wheels adjacent the plow disks 55. Also, this draw bar means is connected with the plow frame at a high enough elevation so that it will exert a downward pull on the plow frame and thus tend forwardly of the universal joint I84.

8 to draw the plows into the ground. 'rnis draw bar means is further arranged so that it will exert a force tending to offset the side draft of the plows and tending to swing the rear end portion of the plow frame in a direction toward the plow disks. The hitch means includes a rear draw bar of adjustable length, Fig. '7, comprising two sections I65 and I66 secured together by bolts I61. The bolts I61 are adjustable into different holes I68 to provide for variations in the length of the draw bar. The rear end of draw bar section I65 is connected by universal Joint means I10 with a shank I1I. The shank I1I is adapted to extend through one of holes I12 in a bracket I13 and has nut and washer means I14 on the rear end portion thereof.

A plurality of the holes I12 are provided in bracket I13 in spaced relation transversely and vertically of the plow frame so that any desired lateral or vertical adjustment of the shank I1I in the bracket I13 may be obtained. The bracket I13 is adjustably secured to the plate 46 as by cap screws I15 that screw into threaded holes I16.' A plurality of the holes I16 are provided in spaced apart relation longitudinally of the plow so that the bracket I13 may be adjusted longitudinally of said plow.

The forward end portion of the draw bar member I66, see Fig. 4, extends through a certical slot I11 in an adjustable guide member I18 that is positioned beneath the front bolster 20. The guide member I18 is supported on a nut means I and the nut means I80 is threaded onto a screw member I8I The screw member I8I is rotatively supported by bearing means rigid with the front bolster 20 and has a head I82 by which it may be turned to move the nut means I80 longitudinally of the screw I8I and transversely of the plow. The nut means I80 slidably engages with a guide member I83 which prevents such nut means from rotating with the screw I8I but allows it to move along the screw I8I when said screw is rotated. The guide member I18 is free to swing on the nut means I80 in a direction longitudinally of the plow but cannot swing transversely of the plow. This guide member I18 thus forms a transversely adjustable fulcrum against which the draw bar I66 presses when tension is exerted on said draw bar.

Just forwardly of the guide member I18 the draw bar I66 is connected by universal Joint means I84 with another draw bar member I85, Figs. 1 and 2. The forward end of the draw bar member I85 is adapted to be connected as by means I 86 with a prime mover I81 (as a tractor), a fragment of which is shown in Figs. 1 and 2.

The steering means for the front plow wheels includes two brackets I80 and I8I rigidly connected with the wheel supporting blocks 88 and 93 respectively and connected with each other by a cross rod I92 having a turnbuckle I63 therein for adjustment. Another rod I84 having a tumbuckle I85 therein connects the bracket I9I with the draw bar I85 at a point a substantial distance Turning movement of the prime mover I81 will operate through rods I 92 and I84 to steer the front wheels of the plow in an obvious manner.

Figs. 12 and 13 show a construction in which the plow frame shown in Figs. 1 to 4 is elongated to make room for a greater number of plow disks in- Figs. 12 and 13, the rear bearing member 3 3 is removed so as to detach the rear bolster 2i and its wheels as a unit. The rear sleeve 32 is removed from the shaft 26 and put onto an extension shaft 200 and said sleeve 32 and the extension shaft 200 are replaced in the rear bearings 3i and 32. A tubular sleeve 262 is slipped over the rear end portion of the coupling shaft 25 and rigidly secured thereto by cross pins or bolts 283 which fit in the holes already provided in said shaft. A plate 204 that is rigid with the sleeve 2%2 is secured, as by bolts 205, to the rear end portion of the angle bar 2'1. The forward end portion of the extension shaft 2% is fitted into the sleeve 202 and secured therein by pins or bolts 2&6. The sequence of the above described operations required in assembling the extension parts to provide a complete and operative plow chassis of greater length may be varied. Also it will be understood that the plow chassis may be lengtherred by substituting frame means of greater length for the frame shown in Figs. 1 to 4 inclusive, using the wheel and bolster structure of Figs; 1 to 4.

The extended plow frame is capable of accommodating the longer assembly of plow disks 23?. The plow disks 2d; are of smaller diameter than the disks 55 and are better adapted for shallow cultivation. Each disk 29? is mounted on a shank 268 by dirt excluding bearing means of a type previously described and shown in Fig. 10. The shanks 258 are similar to the previously de scribed shanks 55. Also each plow disk Edi has a scraper I353 supported by a bracket Hid both of which are similar to parts 39 and 35 that have been previously described.

The shanks 268 are all supported in a bar or plate 2H) and the plate 258 is supported on the hub portions 52 of the two plow beams shown in Figs. 1, 2, '7, 14 and 15. Preferably the toothed adapter disks 82, Fig. 16, are removed before the plate 2 I0 is placed on the plow beams. Also, preferably gear teeth 2!! are provided on the top side of the plate Zlfi for cooperation with the gear teeth 66 of hubbed disks 5? of a type hereinbefore described by which the shanks 288 are secured to the plate 2H3.

' Two of the shanks 298, see the first and third shanks 208 from the right, Figs. 12 and 13, extend up through the hubs 52. 208 extend up through bosses 2 E2 on the plate 2 iii.

In the operation of this machine the depth of cut is determined by adjustment of the supports IS on which the angle bar 27 rests. The

reaction of the plow disks 55 against the ground 5 results in a side draft tending to move the running gear of the plow to the left as it moves forwardly. Also, the plow disks may encounter trash on the ground or patches of hard or packed ground that will tend to lift said disks out of the ground.

The hitch of the draw bar to the plow frame tends to pull the plows 55 into the ground because the point of attachment of the draw bar to the plow is above the point of attachment of said draw bar to the tractor and the tractor pulls at a downward incline on the plow frame.

Also the point of connection of the draw bar with the plow frame is to the left of the axis of The other shanks the coupling member 25 and for this reason the pull of the draw bar tends to resist the side draft and tends to swing the rear end portion of the plow frame to .theright or toward the plow disks. The pull of the draw bar is exerted on the plow frame at ;a point near the plow disks and to the rear of the front wheels. Thus strain and wear on the front wheel assembly is minimized.

If the plow disks strike an obstruction which raises them out of the ground they will not lift the plow wheels but will merely swing the plow frame upwardly about the pivotal axis of the coupling member 26 and will drop back aS soon as they have cleared the obstruction. Also the running gear (including the wheels, bolsters and shaft 28) has substantial weight and will follow the ground even though frame 2'8 and parts connected therewith angularly move. Also the frame 2i and the plow disks will rapidly return to plowing position and not leave substantial amounts pf unplowed ground.

The bolsters 2d and 2! are both free to move angularly about the axis of the coupling memher without subjecting this coupling member'to a twisting strain.

If the machine is to moved on the road adjustments of the wheels'may be made so" that these wheels will run substantially straight with the rear wheels following approximately in line with the front wheels.

Obviously, changes may be made in the forms, dimensions, and arrangement of the parts of my invention, without departing from the prineiple thereof, the above setting forth only pre-- ferred forms of embodiment.

I claim:

In an agricultural machine, two substantially parallel transversely offset bolsters; two

.xially aligned bearing members secured to the respective bolsters diagonally thereof; a rigidcoupling member extending diagonally between said two bolsters and having its two end portions rotatively supported in said axially aligned bearings; an implement carrying frame pivotally supported on said coupling member and extending sidewise therefrom; disc plows carried by said implement carrying means and aligned with said coupling member; and wheels carried by said bolsters and angularly directed toward a furrow being plowed by said disc plows.

2. In an agricultural machine, two substantially parallel transversely offset bolsters; two axially aligned bearing members secured to the respective bolsters diagonally thereof; a rigid coupling member extending diagonally between said two bolsters and having its two end portions rotatively supported in said axially aligned bearings; an implement carrying frame pivotally supported by said coupling member and extendingsidewise therefrom; beam means adjustably carried by said implement carrying frame and adjustable transversely of the machine; implements carried by said adjustable beam means; and draw bar means connected with said implement carrying frame adapted to exert a forward and downward pull thereof.

3. In an agricultural machine, two substantially parallel transversely offset bolsters; two axially aligned bearing members secured to the respective bolsters diagonally thereof; a rigid coupling member extending diagonally between said two bolsters and having its two end portions rotatively supported in said axially aligned bearings; an implement carrying frame pivotally supported by said coupling member and extending sidewise therefrom; beam means supported by said implement carrying frame and adjustable transversely of the machine; draw bar means for said machine; and bracket means adjustably connecting said draw bar means with said implement carrying frame providing adjustment of 11. the location of connection of said draw bar means both longitudinally and transversely of the machine.

4. In an agricultural machine, two spaced apart bolsters; wheels carrying said bolsters; two axially aligned bearing members supported by the respective bolsters; a coupling member having its end portions rotatively supported in said axially aligned bearing members; implement carrying means connected with said coupling member extending to one side thereof and rotatively movable about the axis of said bearing members; ground cultivating implements carried by said implement carrying means; and draw bar means connected with said implement carrying means at a point between said implements and the pivotal axis of said coupling member whereby tension on said draw bar means will tend to swing the rear end portion of said machine in a direction toward said implements.

5. In a plow, spaced apart transversely offset front and rear bolsters; Wheels carrying said bolsters; two axially aligned bearing members supported by the respective bolsters; a coupling member having its end portions rotatively supported in said axially aligned bearing members; frame means connected with said coupling member extending to one side thereof and rotatively movable about the axis of said bearing members; plow disks carried by said frame means positioned to exert a side thrust in a direction toward said coupling member; draw bar means adjustably connected with said frame means between the pivotal axis of said coupling member and said plow disks, whereby a forward pull on said draw bar means will tend to swing the rear end portion of said plow in a direction toward said plow disks; and a guide member on said front bolster for said draw bar.

6. In an agricultural machine, two substantially parallel transversely offset bolsters; wheels carrying said bolsters; two axially aligned bearing members secured to the respective bolsters diagonally thereof; a rigid coupling member extending diagonally between said two bolsters and having its end portions rotatively supported in said axially aligned bearing members; implement carrying means connected with said coupling member and extending sidewise therefrom;

a lifting member mounted on at least one of said bolsters and connected with said implement carrying means; and actuating means powered by at least one of said wheels and connected with said lifting member.

7. In an agricultural machine, two spaced apart bolsters; wheels carrying said bolsters; two axially aligned bearing members supported by the respective bolsters; a coupling member having its end portions rotatively supported in said axially aligned bearing members; implement carrying means connected with said coupling member extending to one side thereof and rotatively movable about the axis of said bearing members; lever means connected with said implement carrying means extending to the other side of said coupling means; a lifting member mounted on at least one of said bolsters and connected with said implement carrying means; and actuating means powered by at least one of said wheels and connected with said lifting member.

8. In an agricultural machine, spaced apart front and rear bolsters; wheels carrying said bolsters; two axially aligned bearing members supported by the respective bolsters; a coupling member having its end portions rotatively sup- 12 ported in said axially aligned bearing members; a frame bar positioned to one side of said coupling member and arranged to overlap both of said bolsters; frame means connecting said bar with said coupling member and rotatively movable about the axis of rotation of said coupling member; two lifting members mounted in the front and rear bolsters respectively arranged to exert an upward thrust on said frame bar; actuating means powered by a rear wheel of said machine and directly connected with the lifting member in the rear bolster; means including a flexible connector extending from the rear bolster to the front bolster and connected with the j lifting member in the front bolster; lever means on said frame means extending to the side of said coupling member opposite said frame bar; and sheaves carried by said lever means receiving said flexible connector and positioned above the normal line of pull of said flexible connector whereby a down pull will be exerted on said lever means when tension is exerted on said flexible connector.

9. In an agricultural machine, two spaced apart bolsters; wheels carrying said bolsters; two axially aligned bearing members supported by the respective bolsters; a coupling member having its end portions rotatively supported in said axially aligned bearing members; a frame bar positioned to one side of said coupling member and overlapping both of said bolsters; frame means connecting said frame bar with said coupling member and rotatively movable about the axis of said coupling member; ground engaging implements carried by said frame means; vertically adjustable supports carried by said two bolsters for engagement by said bar to limit the downward movement of said implements; two lifting members mounted in said two bolsters for lifting engagement with said bar; and means powered by a wheel of said machine for actuating said lifting members.

10. In an agricultural machine, two substantialyl parallel transversely ofiset bolsters; two axially aligned bearing members secured to the respective bolsters diagonally thereof; a rigid coupling member extending diagonally between said two bolsters and having its two end portions rotatively supported in said axially aligned bearings; an implement carrying frame pivotally supported by said coupling member and extending sidewise therefrom; 'beam means supported by said implement carrying frame and adjustable transversely of the machine; disc plows carried by said beam means and aligned with said coupling member; and wheels carried by said bolsters and angularly directed toward a furrow, being lowed by said disc plows.

ENOCH A. DAVIS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 423,032 Deuscher et al. Mar. 11, 1890 1,216,123 Howe Feb. 13, 1917 1,301,628 Weaver Apr. 22, 1919 1,472,768 Dickinson Oct. 30, 1923 1,780,955 Toth Nov. 11, 1930 2,113,556 V De Rocher Apr. 5, 1938 2,155,739 Seaholm Apr. 25, 1939 2,247,865 Hippie July 1, 1941 2,356,770 Lohman Aug. 29, 1944 

